Transcranial direct current stimulation in treatment resistant depression: a randomized double-blind,...

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Trials

Background:

• Anodal transcranial direct current stimulation (tDCS) of the prefrontal cortex is a proposed intervention for major depression.
• This study investigated the efficacy of tDCS in treatment-resistant major depressive episodes.

Purpose of the Study:

• To determine if tDCS is an effective treatment for major depressive episodes resistant to conventional therapies.
• To evaluate the efficacy of anodal tDCS compared to placebo as an add-on treatment.

Main Methods:

• A randomized, cross-over protocol comparing tDCS and placebo was used in 22 patients with major depressive episodes.
• Active tDCS involved 1-2 mA for 20 minutes/day over the left dorsolateral prefrontal cortex for 2 weeks, with blinded conditions.

Main Results:

• No significant difference in depression scores (Hamilton Depression Rating Scale) between real and sham tDCS after 2 weeks.
• Active tDCS showed a 14.7% reduction from baseline, while placebo showed a 10% reduction.
• Subjective mood ratings indicated increased positive emotions with real tDCS compared to sham tDCS.

Conclusions:

• Two weeks of anodal tDCS was not superior to placebo for treatment-resistant depression.
• Secondary outcomes suggest a potential positive impact of tDCS on emotional experience.
• Further controlled pilot trials with modified tDCS protocols are warranted to explore its antidepressant potential.